Cider is made of apples and creates intoxication, addiction even. Rainbow Dash loves Cider and Applejack has decided to use it to her advantage as she plans to get rid of her "good friend".

This story is my lousy version of "The Cask of Amontillado" of Edgard Allan Poe
And a reference to "De Grave of Blueblood" that I discovered recently and that sparked the will for me to write my own version of the story.